21220011211 has 8 divisors (see below), whose sum is σ = 24385428704. Its totient is φ = 18088090560.

The previous prime is 21220011151. The next prime is 21220011217. The reversal of 21220011211 is 11211002212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21220011211 - 2⁷ = 21220011083 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21220011191 and 21220011200.

It is not an unprimeable number, because it can be changed into a prime (21220011217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8372850 + ... + 8375383.

It is an arithmetic number, because the mean of its divisors is an integer number (3048178588).

Almost surely, 2^21220011211 is an apocalyptic number.

21220011211 is a deficient number, since it is larger than the sum of its proper divisors (3165417493).

21220011211 is a wasteful number, since it uses less digits than its factorization.

21220011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16748421.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21220011211 its reverse (11211002212), we get a palindrome (32431013423).

It can be divided in two parts, 2122001 and 1211, that added together give a palindrome (2123212).

The spelling of 21220011211 in words is "twenty-one billion, two hundred twenty million, eleven thousand, two hundred eleven".